For a change of address for a suppressor, the instructions are on the back of the form 4. I don't know why people don't read the instructions on the back of the form 4. In the case of a suppressor and an address change, all that is needed is to inform the ATF in writing. The address is also given on where to send the written memo or letter. It is that simple and no forms are necessary. I hope some people will look more closely at these documents and quit spreading erroneous information.
To the OP, I agree and don't do anything at this time. Than when you have the suppressor and the form 4 tax stamp in hand, notify the ATF in writing of the address change. Read the back of the form 4 for instructions as I indicated above. Good luck and enjoy.